Mechanical movement



pr 1937- o. A. NETS CHKE MECHANICAL MOVEM-ENT Filed Janx6, 1936 IIIIIIHIII iLullnlllf'i' INVENTOR.

Uscar/Z Msfile.

ATTORNEY.

Patented Apr. 1-3, 1937 UNITED STATES PATENT '0 F Fl C' E MEDHANIGAL Oscar .AJNetschke, St. Clair Shores, Mich.

Application Januaryafi, I936, Serial No. 57.647

1 -3 .Claims.

"This ainvention relates to rotary tooth "brushes :and the object-of the invention =isto provide-a irotary tooth :brush in which the mechanism for rotating the brush is contained wvithin a sheet 5 metal handle and operated 'by'means o'fa trigger.

A further objectof'the invention is "to provide a gear mechanism for rotating the brush in which {the gear mechanism is'operated by-asliding rack, *the sliding rack "being *guidedwithin the casing in its longitudinal :movement *in eitheriiirection and the trigger being arranged'to "produce the -driving movement of the rack while-a'spring "is provided for returningthe trigger "and'rackto the starting I position prior to the .next driving movement.

" Another pbject of the :invention is to ,provide a;rack arranged to engage'the wallet the handle member at oneend of its stroke and provided with alug engaging axlue on theihandle toLform astop .atthe other end of its stroke. 7 .A further object of the invention is to provide a "rack having .a flange riding in .sliding engage- .ment with one wall .of the handle member and the'handle member being .provided with depend- 'ing lugs spaced from the said wall so that the flange of the rack rides between the depending lugs andthe wall of the handle member. I Another object of 'the invention is :to provide a longitudinally slidable rack provided with an angular slot inone end and a pivoted trigger having 2. lug engaging in said slot whereby turning movement :of the trigger in one direction of its pivot moves the =racklongitudina1l-y' inonedirection and turning movement of the trigger in the opposite direction moves the rack vinthe opposite direction and a spring tending to turn the trigger to move the rack in one direction only.

These objects and the several novel features of the invention are hereinafter more fully described 40 and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawing in which- Fig. 1 is a section through a rotary tooth brush embodying my invention.

45 Fig. 2 is an enlarged section taken on line 2--2 of Fig. 1.

Fig. 3 is an enlarged section taken on line 33 of Fig. 1.

Fig. 4 is a section similar to Fig. 1 showing the 50 rack at the end of its driving movement.

The device comprises a sheet metal casing I which is provided with a cover member 2 secured thereto. The casing is formed to provide a handle portion 3 and a larger portion 4 for the mecha- 55 nism. Within the portion 4 of the casing and (Cl. ti 130) riding against the straight flange '5 is a rack '6 having a. fiange "1 which rides against the flange ii-as shown in Figs. '1 and 2. This were meshes with asmallgear 8 which is secured to the shaft '9 anda large gear l0 isalse secured to the shaft 5 and adapted to be moved into mesh with a small gear H on the drive shaft I2 and a flywheel 13 is also secured to this shaft 12 as shown in Figs. '1, 2., and 4. The shaft 12 extends through the wall of -the casing l and a fitting I4 "is pressed onto the extending end of the shaft [2 and carries abrush 1'5 as shown in Fig. 2. Oneend of the shaft '5 extends into a slot I6 in the casing I as shown .in Fig. .3 and the .other end of the shaft 9 extends 'into a slot 11 in the cover2. A sleeve 15 L8 is fitted over the shaft 9 between the gear Ill and the .cover of .the casing. This .sleeve i8 is provided with a flange, l9, acting as a guide for the .shaftand preventing the shaft from Jtilt'ing in thecasingfas it is movedin theslots 116 and IT by the rack i6.

.The small gear 8 also rides on the .inner iace of the casing and prevents .theshafit .9 .from tilting in the casing. As will be noted from Figs..2 and 3, thesmal-l gear .8 .is ..of about the same thickness as therack fiand thus the large gear ll] may ride on .the surfaceof therack B and.on the twobosses .3] pressed inwardly from .the bottom of the casing .l asshownin Fig. '3. Iihesetwo,locsses and-the rack .6 provide .a support for the gear .Hi .and prevent tiltingof the gear .l-B and shaft .9 whenmoved the rack. .The positionof .these .bosses 3i is in theater! .in \dotted .lines in relation to .the .rack .5 and gear :lflin l. .A trigger 203s provided ior operating the device and is secured about a pivot 30 pin 2| which is rotatably mounted in the housing I and cover 2 and this trigger is provided with a struck out lug 22 to which a spring 23 is connected and the opposite end of the spring is hooked over a lug 24 struck inwardly from the bottom of the casing l in the handle portion 3. The curved end 25 of the trigger is provided with an extending lug 2B riding in an angular slot 21 in the rack 6.

Under normal action by the spring 23 the trigger 20 is turned to the position shown in Fig. 1 and by means of the lug 26 riding in the slot 2'! the rack is moved so that the curved end 28 thereof engages the wall of the casing as shown in Fig. 1. This movement of the rack 6 moves the gears 8 and I0 and shaft 9 to the right of Fig. l and thus moves the shaft 9 to the ends of the slots l6 and I1 and moves the gear I0 out of mesh with the drive gear I I.

At this time by pulling on the trigger 20 the rack is moved to the left of Fig. 1 thus moving the shaft 9 and gears 8 and ID to the left of Fig. 1 so that the gear i is moved into mesh with the gear ll upon initial movement of the rack 6. Continued movement of the rack 6 rotates the gears 8 and I9 and the gear l0 rotates the gear H and flywheel l3 and also rotates the brush IS. The position of the parts at the end of this drive stroke is shown in Fig. 4 in which position the lug 29 on the flange I of the rack shown more particularly in Figs. 2 and 4 has moved into engagement with the depending lug 30 struck downwardly from the casing cover 2. A second lug 32 is also struck downwardly from this casing cover as shown in Fig. 4 and the flange I of the rack 6 fits between the straight wall of the easing and the inturned lugs 39 and 32 of the cover which act as guides for the rack and allow the rack to be moved longitudinally in either direction. At the end of the driving movement, the trigger 2B is in the position shown in Fig. 4 and upon release of the trigger the spring 23 will turn the trigger back to the position shown in Fig. 1

i and will also move the rack to the right thus moving the shaft 9 to the right and moving the gear I 0 out of mesh with the gear I I so that the parts return to the position shown in Fig. 1 ready for the next driving movement. The device is held in the hand by holding the handle 3 in the palm of the hand and engaging one of the fingers over the trigger and inserting the brush I5 in the mouth. In use, the device is operated by a series of strokes of the trigger 20 and the flywheel i3 is utilized to maintain the brush in rotation between the drive strokes.

From the foregoing description it becomes evident that the device is very simple and eflicient in operation, will not easily get out of order, may be operated entirely with one hand and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is 1. In a rotary tooth brush, a housing having a flat wall portion, a toothed rack having a flange riding on said flat wall portion, a cover for the housing provided with depending lugs extending downwardly on the side of the rack flange opposite the flat wall portion, the flange of the rack being guided between said lugs and said flat wall portion, a pinion gear meshing with the toothed rack, a larger gear secured to rotate with the pinion gear, the rack being provided with an angular slot adjacent one end, a trigger pivotally mounted in the housing and having an end engaging in said slot, the arrangement being such that by turning movement of the trigger on its pivot the rack may be moved longitudinally in either direction in the housing, a shaft rotatably mounted in the housing and having an end extending from the housing, a flywheel and gear on the shaft, said gear meshing with the aforesaid large gear and a spring mounted in the housing handle and arranged to turn the trigger in one direction on its pivot.

2. In a rotary tooth brush, a housing having a flat wall portion, a toothed rack having a flange riding on said flat wall portion, a shaft rotatably mounted in the housing, a gear on the shaft, a large gear rotatably mounted in the side of the housing, the large gear normally engaging against and acting as a guide for the rack, a pair of lugs pressed inwardly from the housing and providing a support for the large gear adjacent the rack, the large gear being movable into or out of engagement with said shaft gear and means whereby movement of the rack toward the shaft gear moves the large gear into mesh with the shaft gear and movement of the rack away from the shaft gear moves the large gear out of mesh with the shaft gear, a pinion gear connected to the large gear and meshing with the toothed rack, a trigger pivotally mounted in the housing;

and turnable on its pivot in either direction to move the rack in either direction and a spring tending to turn the trigger on its pivot in one direction.

3. In a rotary tooth brush, a housing having a flat wall portion, a toothed rack having a flange slidable on said flat wall portion, a cover for the housing having inturned lugs extending in spaced relation with the flat wall portion and over the flange of the toothed rack, 2. lug on one end of the toothed rack adapted to engage one of the inturned lugs of the cover member to limit movement of the rack in one direction, one end of the rack being provided with a curved end adapted to engage the housing wall to limit movement of the toothed rack in the opposite direction, a trigger pivotally mounted in the housing and adapted upon turning movement on its pivot to move the rack longitudinally on said flat Wall portion, a spring resisting turning movement of the trigger in one direction, a shaft and a gear reduction mechanism between the shaft and the toothed rack.

OSCAR A. NETSCHKE. 

